Finding the Fourth Proportional to 20,314.72, 30,444.41 and 12,420.00

Step by Step Solution

1. Step 1: Write the proportion equation
   20,314.72 : 30,444.41 = 12,420.00 : x
2. Step 2: Convert to fraction form
   20,314.72/30,444.41 = 12,420.00/x
3. Step 3: Cross multiply
   20,314.72x = 30,444.41 × 12,420.00
4. Step 4: Simplify right side
   20,314.72x = 378,119,404.95
5. Step 5: Solve for x
   x = 378,119,404.95/20,314.72
6. Step 6: Final answer
   x = 18,613.07